Guiding of Electrons in a Few Mode Ballistic Graphene Channel

Christian Sch\"onenberger; Klaus Richter; Markus Weiss; Ming-Hao Liu; P\'eter Makk; Peter Rickhaus; Romain Maurand; Samuel Hess; Simon Zihlmann

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Guiding of Electrons in a Few Mode Ballistic Graphene Channel

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arxiv 1509.02653 v1 pith:OETC3WLK submitted 2015-09-09 cond-mat.mes-hall

Peter Rickhaus , Ming-Hao Liu , Péter Makk , Romain Maurand , Samuel Hess , Simon Zihlmann , Markus Weiss , Klaus Richter

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Christian Schönenberger

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keywords channelgrapheneballisticcarrierschargemodecalculationscompletely

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In graphene, the extremely fast charge carriers can be controlled by electron-optical elements, such as waveguides, in which the transmissivity is tuned by the wavelength. In this work, charge carriers are guided in a suspended ballistic few-mode graphene channel, defined by electrostatic gating. By depleting the channel, a reduction of mode number and steps in the conductance are observed, until the channel is completely emptied. The measurements are supported by tight-binding transport calculations including the full electrostatics of the sample.

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